Sunday, March 22, 2015

Sunday Morning Insight: Muon Tomography of Fukushima Daiichi's reactor #1

Here is a followup to a previous Sunday Morning Insight (Muon Tomography as a Moore's Law Enabled Technology). I took notice of it on Rod Adams twitter feed: The result of a 26-day Muon Tomography study of Fukushima Daiichi reactor 1. The report is entitled: Reactor imaging technology for fuel debris detection by cosmic ray muon Measurement status report in Unit-1 and features a two angle tomography of reactor #1 and the attendant Spent Fuel Pool in that same building.

Several remarks:
  • The detectors are not low enough to image the reactor material where it probably is (i.e. at the bottom of the Pressure Containment Vessel).
  • There is a discrepancy between the readings of detector 1 and 2. It seems to my untrained eye that this may have to do with detector 1 having a line of sight that includes the spent fuel pool whereas detector 2 has less contribution from that component. The reconstruction algorithm using readings from detector 1 might be putting more emphasis from the higher density of material in the spent fuel than contribution from the reactor core.
  • The algorithm performing the reconstruction does not seem to be using the scattering component as featured in Imaging Damaged Reactors and Volcanoes, Let us note that 26 days is the same ballpark as the 6 weeks mentioned in that study.

Relevant: Sunday Morning Insight: Muon Tomography as a Moore's Law Enabled Technology

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